It is well documented that reading plays a crucial role in success at school and beyond. Studies indicate that reading not only contributes to academic performance, but also enriches vocabulary. Positive reading attitudes and the will to read are factors that determine whether or not students read at school. However, not much reading research has been conducted in Swaziland. Using Form 5 learners from four public schools, this study explores the relationships between reading ability, vocabulary, reading attitudes, habits and access and academic performance among Form 5 Swazi learners. To complement the quantitative study, classroom observations were conducted to contextualise the quantitative results. The combined findings indicate that reading correlates robustly with vocabulary development and also with academic performance. The findings suggest that the ability to read and understand text plays a dynamic role in academic success. For students to be well informed and have a rich vocabulary, schools should make reading a priority. Key words: Reading comprehension, vocabulary knowledge / Linguistics and Modern Languages / M.A. (Applied Linguistics)